Process and apparatus for the manufacture of glass drums and other hollow bodies.



R. HOFPMANN.

PROUESS AND APPARATUS FOR THE MANUFACTURE OF GLASS DRUMS AND OTHERHOLLOW BODIES.

APPLIGATION FILED PEB.2, 1910.

1,021,043, Patented Mar. 26, 1912.

2 SHEETS-8HBET 1.

\NVENTOR, RuDoLF HOFFMRNN,

ATTORNEY.

R. HOFPMAN N.

PROCESS AND APPABATUSVFOR THE MANUFACTURE OF GLASS DRUMS AND OTHERHOLLOW BODIES.

APPLICATION FILED IBB.2, 1910.

2. 12 I mm MW my T n H N 0 Mm WF M n NF A M )0 m HM m b.- P L .9 D u R 34 O 0 1 2 0 D 1 nnmmuu vLANonu/u-n unuwnsmmlnm, u. L-

its finished state UNITE s'TA ns PATENT OFFICE.

RUDOLF HOFFMANN, 0F KOPENICK, NEAR BERLIN, GERMANY.

PROCESS AND APPARATUS FOR THE MANUFACTURE OF GLASS DRUMS AND OTHERHOLLOW BODIES.

Specification of Letters Patent.

Patented Mar. 26, 1912.

Application filed. February 2, 1910. Serial No. 541,621.

To all whom it may concern Be it known that I, RUDoLr I'TOIFMANN,glassmaker, a subject of the King of Prussia, residing at Kopenick, nearBerlin, in the Kingdom of Prussia and Empire of Germany, have inventednew and useful Improvements in the Process and Apparatus for theManufacture of Glass Drums and other Hollow Bodies, of which thefollowing is a specification.

It has been the practice hitherto to manufacture by hand the glass drumsor glass rollers upon which silk is wound in the silk spinning industry,the glass drum or roller being blown by means of a blow-pipe. Thismethod of manufacture necessitates various finishing operations, isinconvenient and involves loss of time.

The object of the present invention is to manufacture the glass drums orrollers by machinery and to deliver them from the machine in a finishedstate, thereby dispensing with any supplementary finishing operations.The manufacture is thus considerably simplified, and the cost ofproduction is reduced.

The invention is not confined to the manufacture of glass drums, butincludes the manufacture of other hollow glass bodies.

The invention consists in first placing molten glass into a hollow moldprovided with movable cores, this mold having the primary shape of theobject to be manufactured, and while still in the warm condition thehollow body thus formed is then placed in a mold having a largerinterior diameter, wherein the article is blown into for the whole ofits length. In order to be able to blow upon the hollow body for thewhole of its length, the cores are formed, so as to inter-engage,consequently there is no wall formed between the two cores which wouldprevent the hollow body being blown for the whole of its length.

Referring now to the accompanying drawings, which illustrate by way ofexample, a form of apparatus by which the process may be carried intoeffect, Figure 1 is a front elevation of the apparatus, Figs. 2 and 3are sectional side elevations, the sections being taken on the line A-B, with the device in two different positions. Figs. 4 and 5 are similarsectional views of Fig. 1, taken on the line GD, the device beinglikewise shown in two different positions. Fig. 6 is a vertical sectionof the mold used for the primary formation of a glass drum. Fig. 7illustrates a vertical section of the second mold, which has a largerinterior diameter. Fig. 8 is a vertical section of the finished glassdrum. Fig. 9 illustrates in perspective the upper lid of the mold.

Within a common frame a, are arranged the devices for the primaryformation and the blowing of the hollow glass body. The first mentioneddevice is provided with two movable cores 6 and 0, adapted to be guidedinto the primary mold cl, which rests on the frame a. The primary moldd, is constructed in two parts, and is held together by means of pins 0,provided with handles, these pins being inserted in the side flanges ofthe mold. Two rods, f f are arranged opposite each other on the mold cl,these rods serving for carrying the body. The cores 7) and 0, are fittedso as to be capable of sliding in a longitudinal direction, and for thispurpose the upper core 5 is carried by a hand lever h, this lever beingpivotally mounted on a standard 9. The hand lever h is usually kept inits upper position by means of balance weights attached thereto. Thecore Z) is guided by a rigid cross arm 2', fixed to two pillars 70,arranged on the frame a, while another cross arm 2', is rigidlyconnected to the core I) and is guided by the pillars 7c. The lower partof the upper core 5 is made so as to be removable, in order that whendesired by the insertion of another piece, another core may be formed.Further there is fastened to the core I), a plate m guided on four rods02, a plate m being fastened to the lower end of the rods a. On the rodsa there are arranged helical springs. The lower core 0 is moved by meansof a hand lever 0, pivotally mounted in the frame a. The core 0 isguided in a manner somewhat similar to that of the upper core, by meansof a cross arm q, sliding on two vertical rods 72, p. The hand lever 0can be fastened in its upper position by means of a movable locking boltr, (Fig. 2), returning to the lower position by gravity. On the otherhand, springs may be arranged on the guide rods, for this purpose.

According to the invention the lower core 0 is pointed at its upper end,the upper core I) being provided with a corresponding recess, whereinthe pointed end of the lower core can engage. This end may beexchangeable for the same reason, and purpose as is the case with thelower end of the upper core.

The closing of the mold at the top and bottom is effected by means ofcovers 8, s and disks 2? t fitting into the covers (Figs. 6 and 7). Thecovers 8 8 may consist of two parts connected with each other in themanner of a pair of scissors (as shown in Fig. 9), so that each covermay be easily opened and shut.

The manufacture of a hollow glass object is effected in the followingmanner. The primary mold d which in the example illustrated is of such aconstruction that it can be used for the manufacture of hollow glassdrums (Fig. 8) is placed with the lower cover 8 together with the disk 6on the machine frame a in the correct position between the pillars 7c.The lower core 0 is then guided upward by meansof the hand lever 0, andkept in this position by the locking bolt 1" (Fig. 3). The hot mass ofglass is then poured into the mold d and the upper cover 8 and disk 25are aflixed to the mold. The core Z) is then pressed down by means ofthe hand lever 72, and slides upon the pointed end of the lower core,the mass of glass being thereby divided, so that the upper flange of theglass drum is formed (Fig. 6). By

reason of the cores interengaging, the hollow' glass body is providedwith an opening for the whole of its length, thus permitting the body tobe blown in the subsequent stage for the whole of its length. It is, ofcourse, evident that either the top or the bottom core may be hollow,and the other core provided with the pointed end. The plate m fastenedto the upper core Z) moves down simultaneously with the latter. guidedon the rods n thereby compresses the springs situated on the rods,whereby the lower' plate 111/ is at the same time moved down and pressedtightly on the upper part 8, t of the primary mold d.

In order to apply the finishing operation to the hollow glass body,after removing the cores 6 0, the primary mold and the parts belongingthereto are placed beneath the blowing device. This device consists of apump 14 arranged above the frame a, and another pump 14, arrangedbeneath the frame a, these pumps being of any desired kind.

- A hollow tube 11 or 1) leads into the two pump cylinders, bothcylinders being controlled by a hand lever w which is connected to thelower pump lever '20 by means of a rod 10 A balance weight is arrangedon the hand lever 20 which has for its object, the return of the handlever into the upper position. The cylinders of the pump are guided bymeans of cross bars along the vertical rods 00,

This plate which is When the primary mold, and its component parts havebeen placed beneath the blowing device, the upper cover with its slopingside surfaces is pushed into a guide in a plate g the pins keeping theparts of the mold together are next taken out, and the component partsof the mold are removed. The blowing mold a which has a larger internaldiameter than the primary mold d and is likewise in two parts, has beenopened already on the one side, and placed on the pump device behind theprimary mold, so that immediately the primarily formed hollow body isexposed it may again be inclosed in the blowing form 2-. The parts ofthe mold z are held together by means of pins 6, in exactly the samemanner as the mold cl, the two halves of the mold are however alwayspivotally connected. The carrying arms f are however arranged in adifferent manner on the mold 2, so as to enable the two halves to beeasily closed. As soon as the mold 2 has been tightly closed by means ofthe front bolts 6, provided with handles, then the blowing device isbrought into action by moving the hand lever 10 up and down. Thecylinders of the pump a, a follow this movement, thereby forcing airinto the mold 2. The glass body in the mold a, and which has a smallerdiameter than the mold is by this means blown out and pressed againstthe walls of the mold, thus receiving its final shape (Fig. 8). Theinwardly extending projections (Z (Figs. 6 and 7) are pro-vided in orderto assure at the center of the molten glass body an extra amount ofglass, so that when the blowing is applied, the thickness of the glasswalls may be uniform,besides providing extra glass to round out thecorners e. projections d are not absolutely necessary, and may beomitted, though for the reasons stated, I prefer to use them.

When the hollow glass body has been blown, the mold is opened and thefinished glass drum removed. In the meantime a new glass body may havebeen formed in the primary mold, so that the manufacture can be carriedout comparatively rapidly. In case the work is carried out so that bothforms are in use at the same time, then naturally it is necessary tohave separate covers 8 s with the disks 2f t for each form.

The manufacture of other hollow glass bodies is carried out in a similarmanner, the shape of the mold and cores of neces sity corresponding tothose of the object to be manufactured.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is 1. An apparatus for the manufacture ofhollow glass bodies, the combination of a primary mold, a pair ofinterengaging cores, and a blowing mold of greater diameter than theprimary mold, one of said cores being provided at the engaging end withan axial bore, the other core being provided with a reduced end adaptedto be received by said here.

2. An apparatus for the manufacture of hollow glass bodies, thecombination of a primary mold, a pair of interengaging cores, and ablowing mold of greater diameter than the primary mold, one of saidcores being provided at the engaging end with an axial bore, the othercore being pro vided with a reduced end adapted to be received by saidbore, the engaging ends of the unreduced part of the cores beingapproximately midway of the mold receiving the cores.

3. A process for the manufacture of hollow glass bodies, said processconsisting in introducing a core upwardly into a primary mold, pouringglass into the mold, introducing a second core downwardly into the molduntil the cores interengage, whereupon the glass body so formed isplaced in a second mold of greater width and blown.

4. A process for the manufacture of glass drums and other hollow bodies,said process consisting in introducing a core upwardly into a mold,placing glass into the mold, introducing a second core downwardly intothe mold until the cores engage, removing the mold to a blowing device,removing the mold and cores, inclosing the glass body with a second moldof greater diameter than the first mold, and blowing the glass for itsfull length against the second mold.

5. An apparatus for manufacturing hollow glass bodies, comprising aprimary mold open at both ends, covers for said ends and havingapertures, a pair of vertically disposed and vertically movable corespassed through said apertures and engaging each other in said mold, asecond mold of greater width than the primary mold, apertured covers forthe second mold, and means communicating with the apertures of thecovers of the second mold for blowing a hollow glass body therein, saidcovers of the second mold being adapted to engage the ends of said bodyat the apertures of the covers.

6. An apparatus for the manufacture of glass drums and other hollowglass bodies, consisting of a bipartite primary glass mold which is openat both ends and provided with closing means having apertures, two coreswhich can be so far introduced into the primary mold through aperturesin the closing means that they interengage, a likewise divided mold ofgreater width than the first mold, which is open at both ends andprovided with apertured covering means, a blowing device which can beattached to the apertures of the closing means of the second mold.

7. An apparatus for the manufacture of glass drums and other hollowbodies consisting of a divided primary mold, which is open at both endsand provided with closing means at said ends, means for closing theprimary mold, means to convey the primary mold to the blowing apparatus,two cores which can be introduced from above and from below into theprimary mold until they interengage, a second, likewise divided, mold ofgreater width in the clear than the primary mold and which is open atboth ends and provided with apertured closing means, means for closingand carrying for-- ward this second mold, a blowing device the blowingmembers of which are attached to the apertures of the closing means ofthe second mold.

8. In an apparatus for the manufacture of glass, the combination of aframe, having a table thereon; a pair of cores vertically disposed andvertically movable and mounted on said frame one above the other, theupper core being disposed above said table and the lower core beingdisposed below the same and being adapted to pass therethrough; meansfor guiding said cores; hand levers fulcrumed to the frame andoperatively connected to said cores; a plate connected at the upper endof said upper core; resilient means yieldingly pressing on said plate,said upper core being provided at its lower end with an axial bore; saidlower core being provided at its upper end with a reduced portionadapted to be received by said bore when said cores are broughttogether; an openable primary mold provided with means for holding thesame closed and adapted to receive said cores when said coresinterengage; annular disks adapted to receive said cores; two-partcovers for the upper and lower ends of said mold and provided withcut-away portions adapted to receive said disks; pumps disposed aboveand below said table; tubes leading into the cylinders of each of thepumps, respectively; levers for controlling said pumps, respectively; alink operatively connecting said levers; guide plates at the ends of thesaid tubes most remote from said pumps; and a blowing mold of a largerdiameter than said primary mold, provided with covers at the endsthereof, said covers being adapted to be received into said guideplates.

Tn testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

RUDOLF HOFFMANN. WVitnesses:

"WoLnnMAn HAUPT, HENRY Hasrnn.

Copies of this patent may be obtained for five cents each, by addressingthe Washington, D. 0.

Commissioner of Patents,

